﻿using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

/// <summary>
/// PDF文档操作类
/// </summary>
//------------------------------------调用--------------------------------------------
//PDFOperation pdf = new PDFOperation();
//pdf.Open(new FileStream(path, FileMode.Create));
//pdf.SetBaseFont(@"C:\Windows\Fonts\SIMHEI.TTF");
//pdf.AddParagraph("测试文档（生成时间：" + DateTime.Now + "）", 15, 1, 20, 0, 0);
//pdf.Close();
//-------------------------------------------------------------------------------------
public class PDFOperation
{
    #region 构造函数
    /// <summary>
	/// 构造函数
	/// </summary>
	public PDFOperation()
	{
		rect = PageSize.A4;
		document = new Document(rect);
	}

	/// <summary>
	/// 构造函数
	/// </summary>
	/// <param name="type">页面大小(如"A4")</param>
	public PDFOperation(string type)
	{
		SetPageSize(type);
		document = new Document(rect);
	}

	/// <summary>
	/// 构造函数
	/// </summary>
	/// <param name="type">页面大小(如"A4")</param>
	/// <param name="marginLeft">内容距左边框距离</param>
	/// <param name="marginRight">内容距右边框距离</param>
	/// <param name="marginTop">内容距上边框距离</param>
	/// <param name="marginBottom">内容距下边框距离</param>
	public PDFOperation(string type,float marginLeft, float marginRight, float marginTop, float marginBottom)
	{
		SetPageSize(type);
		document = new Document(rect,marginLeft,marginRight,marginTop,marginBottom);
    }
    #endregion

    #region 私有字段
    private Font font;
    private Rectangle rect;   //文档大小
    private Document document;//文档对象
    private BaseFont basefont;//字体
    #endregion

    #region 设置字体
    /// <summary>
    /// 设置字体
    /// </summary>
    public void SetBaseFont(string path)
    {
        basefont = BaseFont.CreateFont(path, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
    }

    /// <summary>
    /// 设置字体
    /// </summary>
    /// <param name="size">字体大小</param>
    public void SetFont(float size)
    {
        font = new Font(basefont, size);
    }
    #endregion

    #region 设置页面大小
    /// <summary>
	/// 设置页面大小
	/// </summary>
	/// <param name="type">页面大小(如"A4")</param>
	public void SetPageSize(string type)
	{
		switch (type.Trim())
		{
			case "A4":
				rect = PageSize.A4;
				break;
			case "A8":
				rect = PageSize.A8;
				break;
		}
    }
    #endregion

    #region 实例化文档
    /// <summary>
	/// 实例化文档
	/// </summary>
	/// <param name="os">文档相关信息（如路径，打开方式等）</param>
	public void GetInstance(Stream os)
	{
		PdfWriter.GetInstance(document, os);
    }
    #endregion

    #region 打开文档对象
    /// <summary>
	/// 打开文档对象
	/// </summary>
	/// <param name="os">文档相关信息（如路径，打开方式等）</param>
	public void Open(Stream os)
	{
		GetInstance(os);
		document.Open();
    }
    #endregion

    #region 关闭打开的文档
    /// <summary>
	/// 关闭打开的文档
	/// </summary>
	public void Close()
	{
		document.Close();
    }
    #endregion

    #region 添加段落
    /// <summary>
	/// 添加段落
	/// </summary>
	/// <param name="content">内容</param>
	/// <param name="fontsize">字体大小</param>
	public void AddParagraph(string content, float fontsize)
	{
		SetFont(fontsize);
		Paragraph pra = new Paragraph(content,font);
		document.Add(pra);
	}

	/// <summary>
	/// 添加段落
	/// </summary>
	/// <param name="content">内容</param>
	/// <param name="fontsize">字体大小</param>
	/// <param name="Alignment">对齐方式（1为居中，0为居左，2为居右）</param>
	/// <param name="SpacingAfter">段后空行数（0为默认值）</param>
	/// <param name="SpacingBefore">段前空行数（0为默认值）</param>
	/// <param name="MultipliedLeading">行间距（0为默认值）</param>
	public void AddParagraph(string content, float fontsize, int Alignment, float SpacingAfter, float SpacingBefore, float MultipliedLeading)
	{
		SetFont(fontsize);
		Paragraph pra = new Paragraph(content, font);
		pra.Alignment = Alignment;
		if (SpacingAfter != 0)
		{
			pra.SpacingAfter = SpacingAfter;
		}
		if (SpacingBefore != 0)
		{
			pra.SpacingBefore = SpacingBefore;
		}
		if (MultipliedLeading != 0)
		{
			pra.MultipliedLeading = MultipliedLeading;
		}
		document.Add(pra);
    }
    #endregion

    #region 添加图片
    /// <summary>
    /// 添加图片
    /// </summary>
    /// <param name="path">图片路径</param>
    /// <param name="Alignment">对齐方式（1为居中，0为居左，2为居右）</param>
    /// <param name="newWidth">图片宽（0为默认值，如果宽度大于页宽将按比率缩放）</param>
    /// <param name="newHeight">图片高</param>
    public void AddImage(string path, int Alignment, float newWidth, float newHeight)
    {
        Image img = Image.GetInstance(path);
        img.Alignment = Alignment;
        if (newWidth != 0)
        {
            img.ScaleAbsolute(newWidth, newHeight);
        }
        else
        {
            if (img.Width > PageSize.A4.Width)
            {
                img.ScaleAbsolute(rect.Width, img.Width * img.Height / rect.Height);
            }
        }
        document.Add(img);
    }
    #endregion

    #region 添加链接、点
    /// <summary>
	/// 添加链接
	/// </summary>
	/// <param name="Content">链接文字</param>
	/// <param name="FontSize">字体大小</param>
	/// <param name="Reference">链接地址</param>
	public void AddAnchorReference(string Content, float FontSize, string Reference)
	{
		SetFont(FontSize);
		Anchor auc = new Anchor(Content, font);
		auc.Reference = Reference;
		document.Add(auc);
	}
    
	/// <summary>
	/// 添加链接点
	/// </summary>
	/// <param name="Content">链接文字</param>
	/// <param name="FontSize">字体大小</param>
	/// <param name="Name">链接点名</param>
	public void AddAnchorName(string Content, float FontSize, string Name)
	{
		SetFont(FontSize);
		Anchor auc = new Anchor(Content, font);
		auc.Name = Name;
		document.Add(auc);
    }
    #endregion
}